We pay too much attention to small events, daily conversations, that can be upsetting in the moment but don't matter at all in the future. Interactions with colleagues, bosses, clients, friends... We gave it to much attention in the moment and dwell on it.
If it won't matter in 5 years, then don't spend time on it. Move on.
Don't pay attention to what's gonna be little details in your life that have 0 impact in the long run, even when they seem hard at the time.
Focus on what's important to you.
Be present in the moment and grateful for all the positive events in your life that truly matters.